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use sys

use "alloc.use"
use "die.use"
use "extremum.use"
use "fmt.use"
use "option.use"
use "result.use"
use "slcp.use"
use "sldup.use"
use "sleq.use"
use "slpush.use"
use "slurp.use"

pkg std =
	const getenv :	(name : byte[:] -> option(byte[:]))
	const getenvv :	(name : byte[:], default : byte[:] -> byte[:])
;;

var envkey 	: byte[:][:]
var envval	: byte[:][:]

const envfind = {key
	var i
	for i = 0; i < envkey.len; i++
		if std.sleq(envkey[i], key)
			-> `Some envval[i]
		;;
	;;
	-> `None
}

const getenv = {name
	var buf : byte[128]
	var s

	match envfind(name)
	| `Some val:	-> `Some val
	| `None:
		s = bfmt(buf[:], "/env/{}", name)
		match std.slurp(s)
		| `Fail m: -> `None
		| `Ok data:
			envkey = slpush(envkey, sldup(name))
			envval = slpush(envval, data)
			-> `Some data
		;;
	;;
}

const getenvv = {name, default
	match getenv(name)
	| `Some val:	-> val
	| `None:	-> default
	;;
}